Experimental Research on CO₂ Pool Boiling Heat Transfer Outside a Single Tube

Both theoretical and experimental research on CO₂ physical characteristics and pool boiling heat transfer are taken in this paper. It is analyzed that CO₂ pool boiling heat transfer outside the screwed and smooth tube based on experimental study. It is resulted with the relationship between heat transfer coefficient, evaporating pressure and the heat flux. It is also indicated the enhancement factors of three screwed tube compared with smooth tube. The results provides a basis for promoting CO₂ heat transfer enhancement, and also provides a theoretical support in engineering.